Code-ringing telephone system.



T. G. MARTEN.

CODE RiNGING TELEPHONE SYSTEM.

APPLIQATIOF FILED OCT. 4| 191k lm@ Pamed Oct. 24, 1916.

2 SHEETS-SHEET 1.

WfT/v v T. G. MARIIN. BOD'E RINGING TELEPHONE SYSTEM.

APPLICATION FILED OCT. 4| 19H.

' Patented Oct. 24, 1916.

2 SHEETS-SHEET 2.

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TALBT Gt. MBTIN, DF CHICAGO, ILLINOIS, ASSIGNOR T0 AUTOMATIC ELECTRIC i COMPANY, OF GHICAGG, ELLINOIS, A CORPORATION. F LLINS. v

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To all whom t may concern.

Be it known that ll, TALBo'r G. MARTIN, a .citizen of the United States of America, and resident of Chicago, Cook county,.llli nois, have inventedv a certain new' and'useful 'Improvement in Code-Ringing Telephone Systems,of which the following is a A specification.

My invention relates to telephone systems, and more particularly to improved means for applying ringing current to the called line.

lt relates more particularly to means for applying code ringing to a local battery telephone line upon which are located a plurality -of subscribers lines. These lines are what are vcommonly known as farmer lines, and are Ausually manual magneto lines and have a large number of -substa'. tions. Heretofore when the subscribers have been-permitted to call these lines direct, it has been necessary for the calling subscriber to know the particular ringing code of. the subscriber desired and-to operate his ringing button accordingly.

lt is the object of my invention to devise means whereby this code ringing may be done automatically.

ll have illustrated my invention in connection 4with Aan automatic telephone system in which fa series of automatic switches are employed to-entend .the connection from a common battery calling line to a local battery called line. TheseJ lines comprise a plurality of subscribers- Stations, and the subscribers aresignaled by code ringing. This code ringing is automatically accomplished by'providing a set of interrupter` wheels for operating whena connection is made, the

. code selector does not begin to ring the called subscriber until the interruptor has completed the cycle of its operation and-is specification@ Letters raient.

Application led ctober a, i911. Serial No. 652,78l.

Patented oet. `sa.,

ready to start over again. This is a veryv important featureof my invention, as otherwiseit would not be possible to always obtain the proper operation for code ringing.

' A (Fig. 1) and a called manual substation A F ig. 2) in a system embodying the principlesof my invention.

This connection is established through the 'medium of a subscribers individual or line switch C, a first selector E, a second selector F and a connector H. The organization of systems embodying line switches, ylirst and second selectors andl connectors is well known and need not be described herein. At M (Fig. 2) is shown a-n interrupter device and apparatus for controlling the same,

which is for the purpose of causingrthesup-v ply of ringing-current to a called polystaf tion line to be interrupted according to a certain predetermined code, so as to cause the .substations on the line to be signaled selectively.l At L is shown a codefselecting'de vice which'is' for the' purpose of seleting the` articular combination of interruptions 35 pro hoed by the interrupter M, which interruptions correspond to the ringing code of the particular substation desired.

The automatic substation A may be of any suitable automatic type. As shown herein,

the substatioii is a Lcommon battery threewire automatic substation. By three-wire substation is meant one in which means are provided for controlling the automatic apparatus by ground impulses transmitted overthe two sides ofthe line separately. 'ln

addition to the usual receiver 2, transmitter 3, induction coil 4, switch hook '5 and ringer 6, the substation A is provided with an automatic calling device of the well-known type comprising the impulse springs 7 and 8.

and the toothed impulse wheel 9. The impulse wheel9 is secured to a shaft 10, to

.which latterthere is also attached a dial (not shown) provided with linger holes. 'ln orderltb call any digit with this .automatic calling'device, the nger is inserted in the hole in the dial corresponding to thel digit to be called and the dial is rotated around until the finger strikes a suitable stop. The

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'anger is', aan withdrawn and the din-a1- in such manner that Jnits the springs 20 and 21` lowed to return to normal position. As the dial is drawn down, momentarily forces the spring 8 intocontact withltheground spring 12. As the dial returns toits normal position, the teeth on the impulse wheel 9 force the spring 7 into contactiwith the ground spring 12 a `certain number of times, corresponding to the digit called, after which the tooth 11 once more forces the spring 8 into contact with the ground spring 12. The spring 13 is held out of engagement 'with the-spring 14 until after the receiver has been remove f yfrom the switch hook and the dial rotated.

The armi 15 on the switchhook momen# tarily forces the springs 16, 17 and 18 into contact as the switch hook descends' when the receiver is hung up. The arm 19 perto separate whenever the dial is out of normal position, so as to prevent impulses from-.passing from one side of the' line to the other. I

The subscribers.individual switch C and the master switch D are of the general type shown and described in' British atent to R. W. James N o. 26301 of 1906, and in the W estera Electrician of Chicago, Illinois,V of January 25, 1908. Among its essential details the line switch4 C comprisesa plunger (not shown) which is adapted, when released by the energization of the trip magnet 22, to. be forced into a-bank of springs 23, 24, 25, 26, 27, 28,29 and 30, forcing theminto contact in pairs as indicated in the drawings. with a numberof suchsets of springs, each set *forming a terminal of a trunk line leading to a -selector E. The plunger of the line switch is controlled by the master switch D. when idle it is -always maintained opposite an idle trunk line.A The 'Y plunger ofthe line switch is restored froin' its operated to its normal position by the energization and denergization of the release magnet 31. The cut-off relay 32 is provided for the purpose ofdisconnecting the switch from the line after it is operated. The master switch D comprises among other details a motor magnet 33 for operating a ratchet wheel 34. The ratchet wheel 34 controls the so-.called medium ofthe pins 35 and the arm 36 in such a manner that, as the wheel 34 rotates, the-plunger shaft'carries the plungers of the vidle line switches alonginfront of their "the plunger shaft trunk terminals. When the, plunger shaft reaches the-limit 'of its motibn, the. arm 36 slips off one of the pins 35, whereupon the spring 37 draws downthe arm36 until it strikes the' next pin 35, thereby restoring toits normal position, so that during subsequent rotation of the wheel 34 the plnngers will againl be carried along in front o'f their bank contacts in the same the'impulse tooth 11 vertical impulse switch Each line switch isprovided plunger shaft through the l direction as before. The master switch is provided with a bank of contacts comprising a common segment 38 and one individual contact a for each ltrunk line to which the line switches have access. The wiper 39 keeps the commonsegme'nt 38 in electrical connection with the individual Contact of thetrunk line before which the plungers of the idle line switches are resting.

The selector E is of the general type of selectors VShown in United States Letters Patent No.` 815 321, anted to Keith, Erickson and Erickson arch 13, 1906. Among other details the selector comprises a set of wipers 40, 41 and 42 carried upon a .shaft (not shown) having a vertical motion controlled magnet 43 and by the rotary by the so-called vertical a rotary motion controlled magnet 44. The usual side comprising the Wipers 45, 46, 47 and 48 is controlledby the private magnet 49 in a well-known mannerc Means forrestoring the switch to normal position are The switch is controlled from the calling substation through the medium of the ver- The connector H (Fig. 2)*is of the genprovided in the' usual'release magnet 50. I l

eral type of vconnectorsvitches shown in United States Letters Patent No. 815,176, granted March 13, 1906, to Keith, Erickson and Erickson, and comprises the usual wipers 53, 54 and 55, vertical magnet 56, rotary magnet 57, side switch wipers *58,l 59 and 60, private magnet 61 and vertical and rotary line relays 62 and 63.` The connector H is particularly .adapted to connect a common battery calling line with a local battery called line. The elays 64 and 65vare slow acting relays-that is, relays which denergize slowly after their -energizing circuits have been broken. This slow action maybe obtained by securing a ring of copper around one end of the'core of .the'relay. The usual ringing relay is omitted from the connector H and is supplied in the code selector L. The code selector L comprises the apparatus shown between the dotted lines in` Fig. 2. The wipers 53, 54 and 55 shown at the right of the selector-L belong to the connector H.

The selector L comprises a wiper 66 carried -net and the rotary magnet may be similar in their operation and construction to the rotary magnet and releasemagnet of the connector Hand as shown in 'said connector Patent No'. 815,176. The selector L is provided with a side switch comprising the wipers 70, 71, 72 and 73, which may be like the-side switch .of the connector H eX- cept'that it has vonly two positions.v rEhe side switch is controlled by the private magnet 7 in the same manner as in the selector and connector switches. springs 7 576and 77'are provided, which Springs are permitted to close only after the switch shaft has been rotated one or more steps. The ,relay 78 performs the. same functions as the ordinary ringing relay in the connector switches-that is, when energized it disconnects the calling and the called lines and connects the ringing current generator S with the called line. The code ringing selector L is individual to the connector H, there being one such selector' for each connector in the exchange, which selector is adapted to call the local battery, poly-station lines. 1

The interrupter device M comprises a number of interrupterwheels attached .to a common shaft 79v which'. is adapted to be rotated by a suitable motor (not shown). Each interruptor wheel is adapted to con trol a pair ot'- contact'springs. The wheel 81 controls the springs 80 in such manner as to permit them to be separated only when the mechanism isin its normal position. rihe wheel 82 controlsthe springs 83 so as to separate'them momentarily, just after the wheels leave normal position. The wheel 84:

separates the springs 85 rjustfbefoie the wheels reach normal position upon completion ot a revolution, but permits them to close after the wheelsstart againand before the 'wheel 82 separates the springs 83. The wheels 87 and 87a are code wheels-that is, during their revolution" they close Contact between the springs 88 and 88, so as to produce combinations ofV long and short impulses' corresponding to the ringing codes of different substations on Athe poly-station line. These impulses are for controlling the ringing relay ofthe code selector L, so as to cause the proper impulses of ringing current to fiow over 'the line to signal `the dcsired substation. As shown, the wheel 87 is arranged to produce a short and a long impulse. Although only two code wheels are shown, there would be as many such wheels as thereare substations on themanual line, each code wheel being larranged to produce a combination'v of impulses corre-4 sponding to theringing code, of a different substation on theline'.` The springs controlled by each code Wheel are connected to an individual contact o, in the bank of the code selector L,-there being as many such contacts as there are s'ubstations on the line. The code wheels 'are set `so that `they do not i begin to operate their springs until after the shaft-has rotatedfar enoughfor the wheel 82 to separate they springs 83i`and permit them to close again. '0f course, itawillv be A plurality of Aa plurality of connectors H, whereby said line is made accessible to the automaticsubscribers. Y

In order to give a clearer understanding of the invention, it will be explained in detail how the subscriber at the automatic substation A may obtain connection with and signal the subscriber at substation A. on a manual line. ltwill be assumed that the substation A is substation No.1 on line No. 2220. Therefore, in order to call the substation A', the automatic subscriber must operate his calling devicev for the vnumber 22201. As the substation diei is drawn down to callthe first digit 2 ai'ter the receiver has been removed from the switch hook, the' spring 8 is inonientariiy pressed into contact with the spring 12, whereby an impulse of current is sent from greund Gr through the springs i3 and ifi, 1,2 and 8, rotary line conductor 95, springs 97. and 98, trip magnet 22, springs 100 and Mit, springs 102 and magnet 33 yto the battery lead 105, and

thence through the battery iii to ground G.

The magnet-mis not operativeiy energized over this circuit. The magnet 22, upon energizing, releases the plunger et the iine switch,'allowing it to he .thrust into the bank' to close the springs 23-8@ into contact in pairs, as shown. 'lihe closure ci* contact between the springs 28 and 2t and 25 and 216 extends the iine connection from the calling lineto the rst selector 29 and 30 completes a circuit from ground G2 through said springs 29 and 30 and the cut-oit' relay 32 to the battery lead 105. rl`he relay32, upon energizing, disconnects the trip magnet 22 from the calling line. The

trunk-line leading to the selector E), bank ilo The' closure of contact between the springs 1o cuit islclosed through the motor magnet 33.

'Sincethis' circuit includes the interrupter` spring`s"102, the motor magnet 33 thereupon current over this circuit to be operatively energized. The relay 107, however,'operate's to open the contact between the springs 100 and 101 and to close the contact between the springs 101 and 109, whereby the trip magnets of all the line switches which are controlled by the master switch D are disconnected from battery and an energizing cir` begins to opratein a manner similar to that magnet, upon energizing and denergizing, permits the side switch to pass from first to second positionf.- The'side switch wiper 47,.

v40, 41 and 42 over the contacts in the second row or level of the selector bank. The rotary magnet continues to advance the wipers step by step as long as the side switch remains in second posltion. If the first trunk of a buzzer to ro t\ate-the wheel 34 stepbyclinp inthe second level is idle, the side switch step to advancethe plungersrofthe/idle line switches away from/the trunk seized by the switchl C toward'an idletrunk. If the first trunk after the one seized by the switch C is idle, the wiper 39'breaks the circuit of the relay 107 as soon as it is 'carried ofi' thecontact' 108 by the first step of `the master.

switch. The .relay 107 thereupon returns to normal position and breaks the circuit of the operating magnet 33. If, howeyer, the next trunk is busy, theenergiz'ing circuit of the relay 107 is maintained through the neXt contact in the master switch bank, and the motor magnet 33 operates to advance "the-- plungers another step. The motor magnetwill continue to operate in this manner until the wiper 39 leaves ythe contact of the last busy trunk, so .that the plungers do not come to rest u ntil an idle trunk is reached.

The foregoing operations have taken place while the dial is being rotated by the sub- Ascriber'for the firstdigit. As the dial re turns 'to normal position after being released, the spring 7 is forced into engagement with the spring 12 twice momentarily, after which the spring 8 is once more forced into contact with the spring`12. Each time the spring7 engagesthe spring 12 a ciri cuit is closed from ground G through the springs 13. and 14, springs 12 and 7, vertical line. conductor 96, springs 23 and 24, side switch wiper 45 and vertical line relay 51 of the selector E to the battery lead 105.. Therelay 51, upon energizing, completes a circuit from ground G4 through the springs 110 and 111, 112 and 113, and the vertical mag.

lnet 43 to the batteryilead 105. Since two impulsesare delivered to the vertical `relay 51,.the vertical magnet also receives two impulses and operates yin'response theretov to raise the switch shaft and wipers two steps. The final engagement of the spring 8 with A the spring 12 at the substation causesfa sin- .6d glei impulse to be transmitted from ground nr through the springs 13 and 14,- 12 and 8, rotary line 95, springs 25 and '26, side switch wiper 46 and selector rotary line relay 52 to i I' thebattery lead 105. The relay 52, upon en` ergizing, closes a circuit from ground Gr4 throughthe private magnet 49.. vThe'pr1vate.-

will be stepped. from second to third posif tion by the first operation of the rotary mag, net. This is accomplished by a finger on 'the armature of the rotary magnet `which presses down the armature of the private magnet'when the rotary magnet 1s energized.

lt the first trunk is busy, ho\v ever, the side switch is not tripped to third position upon the first energization of the rotary magnet, because the private bank contact of said busy trunk will bevprovidedvith a guarding 'po' tential, and as soonasthe-.wiper 41 engages thesaid' contact a c rcuit is closl frgm this guarded-contact through the wiper 41, relay 116, side switch wiper 48 (in`second position) and private magnet 49 to battery. The

armature of the private magnet, therefore,

of the rotary magnet and allowing the wipers 40, 41and 42 to come to rest upon the contacts of an idle trunk. The engagement of the side switch wipers 45 and 46 with their third-position contactvpoints extends the line connection through the selector E to the second selectorF. The side switch wiper 48, upon reaching` third position, extends a guarding potential from ground G through the wiper 48, relay 116 and private p wiper 41 to all the first selector private bank Contact of the trunk line leading to the second selector E, which guarding potential is for the purpose of preventing any other first selector from obtaining connection with this trunk line while it is in use.

- The. apparatus is nowA in readiness to receive the impulses for the seconddigit 2 of the number to be called. As the dial isv drawn down to call this digit, an impulse is sent over the rotary line 95 and through the rotary line relay 117 of the second selector F. This preliminary rotary impulse for the second digit, as well as for all succeeding digits, is without function, however, because in the switches of the type shown herein the 4 side switch cannot leave first position until after the vertical magnet has been energized once and it cannot leave second position until after the switch shaft has been rotated one or more steps. position for the second digit, two ground impulses are sent over the vertical line 96, followed by one impulse over the 'rotary line These impulses energize the vertical and rotary line relays, respectively, of the second selector F, causing said second se.

is again grounded twice, after which one impulse is sent over the rotaryline 95. The vertical impulses for this digit pass from the verticalline 96 through the selectors E 'and F through the vertical line relay 62 of the connector and the upper winding of the relay 121 to battery. )The relays 62 and 121,

upon energizing, complete a circuit from -ground GT through the springs 122 and 123,

springs 124, private magnet springs 125, side switch wiper 60 and vertical magnet 56 to battery. The digit called being 2, the vertical magnet receives `two impulses over this circuit and operates to raise the switch shafty and wipers two steps. The energization of the relay 121 by the-vertical impulses also completes a circuit extending from ground (is through the springs 126 and the slow acting relay 64 to battery. The relay 64, upon energizing, by shifting the spring 127 out of engagement with its back contact and into engagement with 4its front contact, disconnects the rota-ry side of the V,line from ground G9 and connects it with the battery lead through the resistance 129. The relay 64 being slow acting, remains energized for an instant after the last vertical impulse is deliycred, and, therefore, when the impulse over the rotary line is sent in, it finds a pathto battery through the rotary relay 63 of the connector, lower winding' of the relay 121, spring 127 kand its front contact and resistance 129 to the battery lead v105. The relay 121, upon energizing, sends another impulse through the relay64. The relay 63,

upon energizing, completes a circuit from ground G7 through the springs 122 and 130, springs 131 and private magnet 61 to bat- As the dial returns to normal tery. The private magnet, upon energizing and denergizing, causes the side switch to pass` from first to second position. When the substation calling device is operated for the fourth digit 0, ten impulses are ,transmitted over the vertical line, followed by one impulse over the rotary line. The relays 62 and 121, upon energizing in response to the impulses for this digit, operates to complete the circuit of the rotary magnet 57 instead of the vertical magnet 56 as before, because the side switch wiper 60 is now in engagement with its second-position contactA point 132. The rotary relay 63,:up'on energizing, completes the circuit of the private magnet in the'same manner as before, there by causing' the side switch to pass from second to third position. The operations of the rotary magnet in response to the impulsesrfor the fourth digit rotates the wipers 53, 54 and onto the contacts 92, 93 a-nd 94 of the desired line No. 2220.

t now remainsvto operate the code selector L to select the proper code wheel on the interrupter lvl to send the proper impulses of current out over the vselected line to ring the particularsubstation wanted. lt has-been assumed that the desired substation A is the substation whose ringing code corresponds to the impulses produced by the wheel 87, the springs 88 of which wheel'are connected with the first contact in the bank of the code selector L. Therefore, in order tosignal the substation A the calling subscriber must operate his calling device again for the digit l-,thereby sending a single impulse over the vertical line, followed by an impulse over the rotary line. i This vertical impulse cnergizes the connector relays 62 and 121 in the same manner as explained for the two preceding digits,l but since the side switch of the con nector is now in third position, the energization of these relays now completes a circuit fronr. ground G7 to theI side switch. wiper 60, as previously traced, thence through the contact 133, side switch wiper 7 0 of the code selector L and operating magnet 67 to battery. Since only `one impulse is delivered over this circuit, the` magnet 67 energizes once, advancing the wiper 66 onto the rst contact. first step, the springs 77, 76 and 75 are per mitted to come into contact, whereby the battery is connected with the relays 134 and 135, private magnet 74 and release magnet As soon as vthe shaft is rotated this '68. `When the rotary line relay 63 of the I position. Of course, the private` magnet 61 of the connector H will be energized by the 15` also supplied from line 96, thence to i'inal rotary impulse, but

-wiper 71, upon reaching its thishas no effect, the connector has ofitstravel. The

since the side switch of .already reached the limit `side switch wipers 72 and 73 of the Vcode bank 93 and the test ring of the ack 91 to protect the called line from rbeing again seized either automatically or manually. In order to finally signal the called subscriber the calling subscriber must pressthe ringis vclosed through the springs-13 and springs 21 and 20, vertical and through the relays 62 .and 121 of the connector H to battery. The relays 62 and 121, upon energizing, comi plete a circuit from ground G7 through the side switch Wiper 70 of the code selector L ing button 2 34, whereby a circuit fiom ground G 14, 23a-and 234,

over a circuit which has been already traced,

thence through the second-position' contact .'point of said wiper, springs 138, relay 139,

relay 134 and springs 75 and 76 to battery. The relay 139', upon energizing, completes a .circuit which forms a locking circuit for itself and the relay 134 and causes the relay 141 Yof the interrupter M to energize when the ringing button at thefsubstation is released. This circuit extends from device M, springs 83 and 140 and the relays 139 and 134 to battery.

The relay 141, uponV energizing, closes the circuit of the relay 142, which operates to close the circuit of the motor which rotates the shaft 79. After the shaft is rotated a short distance, the wheel 82 separates the springs 83, thereby breaking the locking cir# cuit of the relays 139 and 134. The relay 134, being slow acting, does not denergize in'imediately, but the relay 139, being quick acting, denergizes immediatelyand closes anew locking circuit for the relay 134. This circuit-extends from ground G12 through the relay 141, springs and.143, relay'144, springs 145 and relay 134-to battery. The remains energized when time vthe relay 144 energizes to separate the springs`138, so that the calling subscriber cannot interfere with the operations by ,again pressing the signaling button. The relay 134 being energized and the relay 139 being denergized, the circuit is completed from IDuring its revolution,

circuit.

ground' G12 through the relay 141 of the interrupter A GJ at the connector the lower spring of the pair 88 controlled by the code wheel 87, wiper 66, springs 146 and 1'47 and ringing relay 78 to battery. the wheel '87 closes the contact between the springs 88 twice, therebytwice closing the circuit of the ringing relay 78 for a predetermined period. Each time the ringing -relay energizes it disconnects the calling line from the called line and connects the ringing generator S with .the called line. Since two impulses are sent through the ringing relay, two corresponding impulses of ringing current will be sent out over the called line. rlhis will, of course,

ring all the bells on the line, but since each substation has a different signal, Aonly the subscriber at thedesired substation A will answer. After all the code wheels have operated their springs for the last time, and

before the wheels iinallv reach normal posil e tion, the wheel 84 separates the springs 85, thereby breaking the locking circuit of the relays 144 and 134. The inteirupter device will ,come to rest when the wheel 81 reaches normal position and allows the springs 80 to separate, thereby opening the circuit of the magnet 142 which controls the motor Frein the above description of the operation of the code selector L, it will be geen that the circuit from the ringing relay to the springs ofthe code wheel is not closed immediately upon the opeiatioii of the ringing button at the calling substation, but the apparatus is placed in a condition whereby said circuit will be closed as soon as the wheel 82 separates the springs 83. Thus, it will be seen that if the interrupter is being used by some other subscriber at the time the subscriber at substation A presses his ringing button, the ringing relay 7 8 will not begin to be operated until after the code wheelshave completed their vrevolution and -are ready to start over again. It will be vbutton were' pressed, and if the interruptor device were already operating, the code wheels might be part way around, and the ringing relay -would lose one or more of its impulses, thereby giving the wrong signal. With the arrangement shown herein, the code wheels cannot begin Vto send impulses to the ringing relay except at the hcginning of the code.

During the conversation the local battery substation of course receives talking current from its own local battery. The common battery automatic substation receives talking current from the central office battery ll overa circuit which extends from ground H through the spring 127, lower winding of the relay 121, rotarv relay 63, thence to and through the calling lUS , and 18 are momentarily forced into contact,

thereby grounding both the vertical and rotary line conductors 96 and 95. The grounding ot the line imbalances the relay 121, causing it to be energized; The relay 121, upon energizing, closes the circuit of the relay 64 in the usual manner. Therelay 61, upon energizing, shifts the connection of the lower winding ot the relay 121 frein the grounded to the non-grounded terminal ot the battery, whereupon theirotary line relay 63 becomes energized, owing to the fact that the rotary line 95 is grounded at the substation release springs. The relays 6 1 and', upon energizing, close the circuit ot the private magnet 61 in the same' manner as has been previously explained. The combined energization ot the relays 62 and 63 and the private magnet 61 con'ipletes a circuit from ground G7 through the springs 150 and 151, springs 152 and relay 65 to the battery lead 105. The relay 65, upon energizing, completes a circuit extending from ground G at the selector F (Fig. 1)

through the side switch wiper 158, relay 154,l

private wiper 155, release trunk conductor 121, springs 156, thence through the release f. magnets 157 and 68 of the switches H and L in multiple to the battery lead 105. The magnets 157 and 68 of the switches l-l and L immediately restore the wipers and the side s vitches or' their respective switches to normal position. The relay 1541 ot the selector l?, upon energizing, completes a circuit ex' tendii'rg from ground GG at the selector ll through the side switch wiper 418, relay 116,

private wiper d1, springs 15S andrelease magnet 159 ot the selector F to the battery lead 105. The relay 116 of the selector E, upon energizing, closes the circuit o the release magnet 50. The release magnet 50, upon energizing, closes a circuit Jfrom ground G15 to and through the release magnet 31 of the line switch C to battery. r1l`he release mgnets 159, 50 and 31 attract their armatures and hold theml 'in readiness to nelease their respective switches when the ma gwnets are denergized. The substation re lease springs separate and remove the ground from the line conductors 95 and 96 just before the switch hook reaches the' limit of its downward motion. rlfhe relays 62, 63 and 121 .of the connector thereupon denergize and break the circuit of the slow acting C are all restored to 'normalposition relay 65; i This relay .denergizes after -a short time and breaks the circuit of the release magnets-68 and 157-a-nd of the release relay 154 of the Lselector Ff This relay thereupon denergizes vand breaks the circuit of its own release magnet 159 and of the relay 116 of the selector E .The relay d116, upon denergizing, breaksY the circuit of the release magnet 5(),'-which in turn breaks the circuit of the magnet 31 of the switch C, whereupon'the switches EXE and The relay 65 of the connector H is slow acting,

ksubscriber would have been given the busy signal in the following manner: As has been explained, whenever a line isin use there is a guarding ground potential from'the connector `private bank contacts .of said line. Therefore, it the called line is busy,-the private wiper 54 of the connector will be resting upon a grounded contact at the time when the last rtary impulse is delivered to the connector. As has been explained, "this last rotary impulse causes the energization of the private magnet 711 of the code selector L. lf the wiper 54 is'standing upon the grounded contact at this time, a circuit will be closed from said grounded contactthrough said wiper, through the side switch wiper 58 of the connector (in third position), side switch wiper 71 of the code selector L (in first position), springs 160, re-

lay 135 and the springs 77 and 76 to battery.

The relay 135, upon energizing, dioses the circuit of the release magnets 68 and 157 of the' switches L and ll, and' maintains them closedy long enough to give the wipers ofthe codev selector L sutlicient time to return to normal position. rlhe connector H being released, theside switch wiper 59 will be in contact witlmits first-position contact point 161, therebyfconnecting the busy signaling machine T with the calling line to give the calling subscriber the busy signal. circuit over which'the busy signaling current flows extends from one terminal of the The machine T through. the side switch wiper 59,

condenser 162, thence over the heavy conduclors to and through the calling substation and back over the other side of the line, through the relays 62 and 121 of the connector to the battery lead 105, and vthenceto theother terminal of the busy signaling machine.

While 1 have illustrated my invention .l

' connection With an automatic to insure that the code is telephone system of a Well-known type, it is to be under- 'stood tha-tiny invention is not limitedy to such use, butmy improved means for automatically applying code ringing to the subscribers lines is capable ofuse in telephone systems broadly, and I do not desire to limit myself to any particular type of system. What I claim as my invention is`:-

1. In a telephone system, a party-line, a,

plurality ofsubstations on said line, means for automatically predetermining .a Ncode signal, means for signaling saidstations according to said predetermined code and automatlc'means to insune that the-.code is always applied to the line at the beginning.

H2. In a telephone system, a party-line, a plurality of signals on said line at the substatiOnS, a sourceof. ringing current, .auto' matically-controll'ed means for connecting said ringing current with the line, means for then operating said signals according to apredetermined code and automatic means .the line at the beginning.

3. Inatelephone system, a party-line, a .plurality of signals on said line, a source of ringing current, a relay'for connecting said ringing current Withthe line, and a plurality of interrupters for controllingsaid relay according to a predetermined code.

4. In a telephone system, a party-line, a

source of ringing current, a relay 'for con-l necting said source with said line, a plurality of interrupters for controlling the relay according to a predetermined code, and a step-by-step-operated device for connecting the relay with any desired interrupter.

5. In a telephone system, a party-line, a plurality of signals on said line, automati-l cally-controlled means vfor operating said signals according to a predetermined. code,

and meansfor rendering said operating' means inoperative except at the beginning @inthe code series. 1

V"lnxin telephone system, a party-line, a

plural-tifof signals on said line, a sourceof ringing current, vme'ans including a'plurality of interrupters for connecting saidv source4 of current Otothe line so as to operate said signals according? to a predetermined code, and means foil rendering said connecting means inoperative except atthe beginning of the code series.

In atelephone system, a party-line,a plurality of. signals on said line, a source of ringing current, a relay for connecting said ringing current with the line, a plurality of interrupters for-controlling said relay according to a predetermined code, and

"means for rendering said relay inoperative for connecting said current with the line except when said interrupters are at the beginning of the code series.

always applied to ringing current with the line,

' stations,

.except at' the beginning 8. In a telephone system,1a party-line, a source of ringing current, a relay for connecting said source with said line, a plurality of interrupters. for controlling said relay according to a predetermined code, a step-by-step-operated device for connecting sa/id Arelay with any desired interrupter, and means forrendering said relay inoperative for connecting said source with the line eX- cept when said interrupters are at the beginning of the code series.

9. In a telephone system, a party-line, a

plurality of substations on said line, meansl for automatically predetermining a code signal, means under the control of the callingsubscriber for signaling said stations according to said predetermined code and automatic means to insure that the codel is always `applied to the line at the begin- I'lll'lg. 'a *A l 10. In a telephone system, a party-line, a plurality of signals on said line at the substations, a source of ringing current, means at the central station under the control of asu the calling subscriber for connecting said ringing current with the lineso as to operate said signals according to a predetermined code, and automatic means to insure that the code is always applied to the line at the beginning.

11. In a telephone system, a party-line, a

plurality of signals on said line, a source of ing the relay with any desired interruptor.

13. 1n a telephone system, a party-line, a plurality of substations on said line, means under the control oi the calling subscriber for automatically signaling said stations according to a predetermined code, and means for rendering said signaling means inoperaseries.

14. Ina telephone system, a party-linc, a plurality of signals on said line at the suba source of ringing current, means under the control of the calling subscriber for connecting said ringing current with the line solas to operate said signals according to a predetermined code, and means for rendering said connecting means inoperative of the code series.

-tive except at the beginning of the codeff' ing current with the line, and means for rendering said relay inoperative for connecting said ringing current With the line except When said interrupters are at the be- 4ginnin of the code series. n

16. na telephone system, a party-line, a source or' ringing current, a relay for connecting saidl source with said line, a plurality of interrupters for controlling the relay according to apredetermined code, a step-by-step-operated device under the control of the calling subscriber for connectin the relayvvith any desired interrupter, an means for rendering said relay inoperative for connectingsaid ringing current with the -line except when said interrupters are at the beginning. of thecode series. v

17. In a telephone system, a party-line, a

plurality of substations on said line, meansincluding one or more automatic switches for extending a connection to said line, means for -automatically signaling said substations on said lineaccording to a predetermined code and automatic means to insure' that the code is alwaysapplied tothe line at the beginning.

18. In a vtelephone System, a party-line, a plurality of signals on saidline at the substations, means including one or more automatic switches for extending a connection to said line, a source of ringing current, automatically-controlled means for connecting said ringing current With the line' so as to operate said signals according to apredetermined code and automatic means to insure that the code is always applied to the line at the beginning.

19. In a telephone system, a party-line, a plurality of signals on said line, means including one or more automatic switches for Aextending a connection to said line, a source of ringing current, a relay for connecting said ringing current With said line, and a plurality of interrupters for controlling said relay according to a predetermined code.

20. In a telephone system, a party-line, means including one or 'more automatic switches for extending a connection to said line, a source of ringing current, a relay for connecting said source With said line, a plurality of interrupters for controlling the relay according to a predetermined code, and a step-by-step-operated device for connecting the relay with any desired interrupter. 21. In a telephone system, a party-line, a plurality ofv signals on said line,.means in cluding one or more'automatic switches-for extendingl a connection to said line, automatically-controlled means for operating said signals according to, a `predetermined code, and means for rendering said operatfV ing means moperatlve except at the begin-4 ning of the codel series.

22. Ina telephonesystem, a party-line, a plurality ofsignals on said line, .means includin .one or more automatic switchesfor extendmg a connection to said line, a source of ringing current, means including a plurality of interrupters for connecting said source of current to the line so 'as to operate said signals according to a predetermined code, and means for rendering said connect-- ing means inoperative except atthe beginning of the code series. 23. In a telephone system, a party-line, a

plurality of signals on said line, means including one or more automatic switches for extending a connection to said line, a source of ringing current, a relay for connecting said ringing'current.- with the line, a plurality of interrupters for controlling said relay according to a predetermined code, and means for rendering said .relay inoperative for connecting said current with the line except When said interrupters are at the beginning of the code series.v

relay according to a predetermined code, a.

step-by-step-operated device for connecting said-relay Withany desired interrupter, and means for rendering said relay inoperative for connecting said source with the line e'xcept when said interrupters are at the beginning of the code series.

25. In a telephone system, a party-line, a plurality of substations on said line, means including one or' more automatic'switches for extending a connection to said line, means under thecontrol of the calling subscriber for automatically signaling said sta tions according" to a predetermined code and automatic means to insure that the code is always applied to the line at the beginning.

26. In a telephone system, aparty-line, a plurality of signals on said line at the substations, means including one or more automatic switches for extending a connection vto said line, a source of ringing current,

means under the control of the calling subscriber for connecting said ringing current' with the line so as to operate said signals according to a predetermined code and automatic means to insure that the code is al- Ways applied to the line at the beginning.

27. In a telephone system, a party-line, a'

cludingonepr more automatic switches for extending atconnection to said line, a source offringing current, a relay for lconnecting said :ringing current with the line, a pluralityof'interrupters orcontrolling said relay according toa predetermined code, and means 'under' the control of the calling subscriber for controlling said connection of the ringing 'current with theline.

28; Ina telephone system, a party-line, l means including one or more. automatic v"switchesforextending a connection to said `lin'e,17a source ci?,v ringing current, a relay :forYconnecting said source with said line, a plurality ofinterrupters for controlling the 'relay according to a predetermined code, anda step-by-step-operated device under the control of the calling subscriber for connecting the relay With any desired interrupter.

29. In a telephone system, a party-line, a plurality of substations on said line, means including one or more automaticswitches for extending a connection to said, lire, means under the control of the calling subscriber for automatically signaling said stations according to'a predetermined code, and means @or rendering said operating means inoperative vexcept at the beginning of the code series.

30. In a telephone system, a party-line, a

plurality of signals on said line at the substations, means including one or'r more automatic switches for extending a connection to said line, a source of ringing current, means under the control of the calling subscriber for connecting said ringing current with the line so as to operate said signals according to a predetermined code, and means for rendering said connecting means inoperative except at the beginning of the code series.

31. In a telephone system, a party-line, a plurality of signals on said line, means including one or 'more automatic switches for extending a connection to said line, a source of ringing current, a relay for connecting said 'ringing ycurrent with the line, a plurality of interrupters for controlling said relay according to a predetermined code, means under the cont-rol of the calling subscriber for controlling said connection oiE the ring ing current with the line, and means for *rendering said relay inoperative for connecting said ringing current with the line except 'when said interrupters are at the beginning of the code series;

32. In a telephone system, a party-line,

V means including one or more automatic switches ior' extending a connection to said f line, a source of'rmging current, relay for connectingsaid source with said line, a plurality of interrupters `for controlling the relay according to a predetermined code, a step j by-'step-operated device under the control of the calling subscriber for connecting the relay with any desired interrupter, and means for rendering said relay inoperative for connecting said ringing current with the line except when said interrupters are at the beginning of the code series.

33. In a telephone system, a party-line a plurality of signals on said line, means or operating said signals according to a predetermined code, said means including a step-by-step selector switch, a side switch for said selector switch, and means for controlling said side switch.

34. In a. telephone system, a party-line, a source of ringing current, means for connecting said ringing current with said line, a plurality of interrupters adapted to control the application or' said ringing current to the line according to predetermined codes, a stepby-step switch for selecting one of said interrupters, another interrupter, and meanscontrolled by said last-mentioned interrupter for preventing connection of said ringing current with the line except when said first-mentioned interrupters are at the beginning ofa code series.

35. In a telephone system, a plurality of subscribers lines, means including one or more automaticswitches for extending a connection between a calling and a called subscribers line, a calling device for 'controlling said automatic switches, a source of ringing current, a step-by-step switch, means for controlling said step-by-step switch by said calling device, means controlled by said switch for automatically applying ringing current to the called line according to a predetermined code and automatic means to insure that the code is always applied to the line at the beginning.

36. Ina telephone system, means including one or more automatic switches for extending a connection from a calling to, a called subscribers line, a calling device for controlling the operation of said switches, a source of ringing current, a series of interrupters, a step-by-step switch under the control of said calling device for selecting one of said interrupters to control the application of ringing current to the line according to a predetermined code, means un der the control of the calling subscriber Jfor connecting said ringing current with the line and automatic means to insure that the code is always applied to the line at the beginning.

37. In a telephone system, a line, a plulines, a plurality of signals associated With each of said lines, a plurality of code senders for operating said signals, electrically controlled meansfor selecting any one of said lines aniwfor selecting any one of said4 senders forapplying the sender to the line to send a code signal thereover to operate the signals on said line, and automatic means for controlling the senders to insure that the code begins at the beginning. l

39. In a telephone system, a party line, a Vplurality of substations on said line, electrically controlled means for signaling said stations according to a predetermined code, am! automatic means for insuring that the code is delivered to the line from the beginning.

40. In a telephone system, a party line, a plurality of signals on said line at the substations, a source of ringing current, automatic controlling means for connecting said ringing current with said line to operate said signals according to a predetermined code` and automatic means for insuring that the code is delivered to the line from the beginning. u

41. In a telephone system,a party line, a plurality of signals on said line, automatically controlled means for operating said signals according'to a predetermined code, and automatic means for rendering said operating means inoperative except at the beginning of the code series.

42. In a telephone system, a party line,

of ringing current, electrically controlled means including a plurality of interrupters y,

for connecting said source of current to the line so as to operate saidsignals according to7 a predetermined code, and automatic means for rendering said connecting means inoperative except at the beginning of the code series.

43. Inl a telephone system, a party-line, a plurality of signals on said line, a source of ringing current, a relay for connecting said ringing current with the line, laI plurality of interrupters for controlling said relay according to a predetermined code, and automatic means for rendering' said` relay inoperative for connecting said current with the line except When said interrupters are atthe beginning of the code se- 44. In a telephone system, a Aparty-line, a source of ringing current, a relay for connecting said source With -said line, a plurality of interrupters for controlling said i relay according to a predetermined code, a

step-bystepoperated device for connecting said relay with any desired interrupter, and automatic means for rendering said relay inoperative for connecting said-source with lthe line except when said interrupters are at the `,beginning of the code serie 45. In a telephone system, a party-line, a plurality of substations on said line, electrically controlled means under the control of the calling subscriber for signaling said stations according to a predetermined code, and automatic means to insure that the code is always applied to the zline at the beginning.

46. In a telephone system, a party-line, a plurality of signals on saidline, a source of ringing current, a relay for connecting saidsignaling said stations according to a predetermined code, and automatic means for rendering said signaling means inoperative except at the beginning ofthe code series.

4S. In a telephone system, a party-line, a

plurality of signals on .said line at the substations, a source of ringing current, electrically controlled means under the control Aof the calling subscriber for connecting said ringing current with th, line so. as to operate said signals according to a predetermined code, and automatic means Jfor rendering said connecting means inoperative except at the beginningof the code series.

49. In a telephone system,a party-line, a plurality of signals on said line, a source of ringing current, a relay for connecting said ringing'current `with the line, a plurality of interrupters for controlling said relay according to a predetermined code, electrically controlled means under the control of the calling subscriber 'for controlling said Qonnection of the ringing current with the line, and automatic means for rendering the relay inoperative for connecting said ringing y current With the line except When said interrupters are at the beginning of the code series.

50. In a'telephone system, a party-line, a

source of ringing current, a relay for connecting said source with said line,a pluplurality of signals on said line, means 1ncluding one or more automatic switches for matically-controlled means for operating said signals according to a predetermined code, and automatic means for renderingsaid operating iscans'inoperative except at -the beginning of the code series.-

52. In a telephone system, a party-line, a plurality of signals on said line, means including one or more automatic switches for extending a connection to said line, a source of ringing current, means including a plurality of interrupters for connecting said source of current to the line so as to operate said signals according to a predetermined code, and automatic means for rendering said connecting means inoperative except at the beginning of the code series.

53. In a telephone system, a party-line, a plurality of signals on said line, meansA including one or more automatic switches for extending a connection to said lines, a source of ringing current, a.relay for connecting said ringing current with the line, a plurality of interrupters for controlling said relay according to a predetermined code, and automatic means for rendering said relay inoperative for connecting said current with the line except when said interrupters are at the beginning of the code series.

54. In a telephone system, a party-line, means includingone or more automatic switches for extending a connection to said line, a 'source of ringing current, a relay for connectingv said source with said line, a plu-'- rality of interrupters orcontrolling said relay .according to a predetermined code, a step-by-step-operated device for connecting said relay with any desired interrupter, and

automatic means for rendering said relay inoperative Ifor connecting said source with the line except when said interrupters are at the beginning of the code series.

55. In a telephone system, a party-line.y a

plurality of signals on said line, means including one or more automatic switches for extending a connection to said line, a source of ringing current, a relay for connecting said ringing current With the line, a plurality of interrupters for controlling said relay according to a predetermined code and automatic means under the control of the calling subscriber for controlling said connection of the ringing current With the line.

5G..In a telephone system,` a party-line, a plurality of substations on said line, means including one or more automatic switches for extending' a connection to said line, means runder the control of the calling sub- Scriber for automatically signaling said stations' according to a predetermined code.

and automatic means for rendering said operating means inoperative except at the beginning of the code series.

' 57. In a telephone system, a party-line, a plurality of signals on said line at the substations, means including one or more automatic switches for extending a connectionv to said'line, a source of ringing current, automatic means under the control of the calling subscriber for connecting said ringing current with the line so as to operate said signals according to a predetermined code, and v automatic means for rendering said connecting means inoperative except at the beginning of the code series.. Y

tomatic means under the control of the calling subscriber for controlling said connection of the current with the line, and automatic means for rendering said relay iiioperative for connecting said ringing current with the line except when said interrupters are at the beginning oi the code series.

59. In a telephone system, a party-line, a source of ringing current, electrically controlled'means for connecting said ringing current with said line, a plurality of interrupters adapted to control the application of said ringing current to the line according to predetermined codes, a step-by-step switch for selecting one of said interrupters`v another interrupter. and circuit means con trolled by said last-mentioned lnterruptcr for preventing connecting of said ringing current with the line except when said first mentioned interrupters are at the beginning of a code series.

GO. In a telephone system, a trunk line. an automatic impulse transmitter adapted t0 be connected to said trunk` said transmite ter including a rotating impulse wheel, and

`means for preventing said impulse trans- A TALBOT (l. MR'I Witnesses: l

ARTHUR J. RAY, E. D. FALns.

IIS 

